Elton John and David Furnish want another baby.

The high-profile couple - who wed in a civil partnership in 2005 - are looking forward to a relaxing summer break and will use the time off to discuss the possibility of having a sibling for 17-month-old Zachary, who was born through a surrogate mother.

"We are going to take some time this summer and get off the treadmill, have a holiday and talk about the possibility of maybe starting on a second child. Nothing has been decided yet. We have to plan it. We're dependent on other people, the egg donor, a surrogate... We have to work together as a team. You can't just snap your fingers and make it happen," David said.

David, 41, has previously admitted he and Elton think a sibling would be good for Zachary: "I would like Zachary to have a sibling. I think he would be better with a sibling than on his own."

It seems Elton could use the break he and David have planned as last week the 65-year-old star was admitted to the hospital with a respiratory infection, forcing him to cancel some planned concerts in Las Vegas.